**6. Conclusions**

The power supply restoration time analysis of power transmission lines shows that it depends on several constituents. The constituents of time restoration analyzed in this study are:


In this article, the methods of obtaining each of them were proposed and described. The case study calculations were realized for the Russian power supply company "Oreolenergo". The obtained restoration time was theoretically equal to 5.28 h. This value is equal to the statistical data obtained from the selected power supply company. The result deviation was less than 10%. Additionally, after obtaining the value of PS restoration time, it was proposed how it may be decreased. The proposition of the technical means of electrical network automation was indicated. These means were proposed and ordered in accordance to the time intervals they shorten.

Future research directions will be aimed at numerically estimating the impact of methods and technical means of electrical network automation on the constituents of the power supply restoration time. This will allow evaluating the effectiveness of their introduction by comparing the received values of the power supply restoration time constituents with initial ones and determining the reduction in damage from a lack of electricity supply.

**Author Contributions:** Conceptualization, A.V. (Alexander Vinogradov); methodology, A.V. (Alexander Vinogradov), and A.V. (Alina Vinogradova); validation, M.J. and T.S.; formal analysis, V.B., M.J., and E.J.; investigation, V.B., A.V. (Alina Vinogradova); resources, A.V. (Alexander Vinogradov); data curation, A.V. (Alexander Vinogradov); writing—original draft preparation, V.B.; writing—review and editing, M.J.; visualization, V.B., A.V. (Alina Vinogradova); supervision, T.S., Z.L., R.G.; project administration, A.V. (Alexander Vinogradov); funding acquisition, Z.L. All authors have read and agree to the published version of the manuscript.

**Funding:** This research received funding from the Chair of Electrical Engineering Fundamentals (K38W05D02), Wroclaw University of Technology, Wroclaw, Poland.

**Conflicts of Interest:** The authors declare no conflict of interest.
